>Hi,My son has built a few years ago PC which in fact stayed in his box. I am trying now to use it. >>I run this on:> Processor 4th Generation Intel Core™ i7 4790K 4.0GHz Socket LGA1150 > Mother Board Asus MAXIMUS VII HERO Z97 Socket 1150 VGA DVI HDMI 8-ch audio ATX Motherboard> Graphical Processor Unit GeForce GTX 780 3GB PCI-Express 3.0 HDMI DirectCU II> RAM Corsair 16GB DDR3 1866MHz Vengeance Memory> Disk SSD Crucial 512GB M550 SATA 2.5\" Internal Solid State Drive> Disk HDD Seagate Barracuda 3.5 inch 2TB 7200 RPM 64MB 6GB/S Internal SATA Drive [PC]> Cooler/Fan Corsair Hydro H110 Liquid Cooling System>> Power Suply Unit CORSAIR ENTHUSIAST SERIES RM850 MODULAR 80+ GOLD 850w PSU>I have just upgraded to Windows 10. I have also upgraded all drivers I could find (BIOS, Motherboard, GPU, Windows...)>>The issue is that without the Graphic card the computer seems to work fine no problem, however when I insert the graphic card when started up the computer randomly abruptly shutdown itself and reboot.>>At a time point it was continuously rebooting without even giving time to the BIOS to be loaded. I changed then the graphic card to another slot in the motherboard which alleviate the problem still happening every 2 to 4 hours randomly.>>Is there something I'm missing I should do? Does anyone can assist in this issue?>>Many thanks in advance,EZ

Very difficult to know what is happening there... In general, when a system does a reboot, it's either a BIOS issue.. or there is some problems with power...

The Maximus VII Hero has a Q-Code display.. as well as four hardware initialization LEDs.. See if you can fid those LEDs.. CPU, DRAM, VGA, Boot Device... and watch them as this odd behavior occurs... Report what you see...